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Of the 200 graduate students who were interviewed for a par time position at a call center, 110 had a bicycle, 25 had a master card and 130 had a mobile phone. 50 of them had both, a bicycle and a master card, 30 had both, a master card and a mobile phone and 60 had both, a bicycle and mobile phone and 10 had all three. How many candidates had none of the three?

 

How do you start a problem like this?

 Aug 16, 2020
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Draw a venn diagram:

Well....you can't       if only 25 have a card.....how can 50 have a card and a bike?    

         Please proofread ....what should '25 had a mastercard ' be?

 Aug 16, 2020

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